... of distance. And comparable foreign SRF05, SRF02 Ultrasonic Ranging Module. Module precision, blind spots (2cm) super close, stable distance ... Panel wiring, VCC, trig 's (control side), the echo (receiving end), out (empty feet), GND9: Note: TRIP-pin internal pull ... if they have re-energized before they solve.This module can be provided ranging program: C51, PIC18F877 microcontroller Yoshitatsu ...